Electrostatically and Electromagnetically Focused 60kW Electron Gun for High Voltage Applications

The success of electron beam technology is mainly attributed to the immense research and synthesis of basic science and technology in many fields mainly attributed to high voltage engineering, vacuum technology, advanced level computer technology and electron optics. In this paper, a rigorous effort has been made to electrostatically and electromagnetically focus electron beam, generated from a high power electron gun that can be used for various high voltage applications including melting and evaporation of refractory materials, coating applications, electron beam welding, plasma generation and material processing techniques. In this paper, electrostatic focusing is achieved in the pre-anode region by applying suitable potential to gun electrodes and by their appropriate geometric design. Electromagnetic focusing is achieved by applying suitable magnetic field incorporating focusing coils in the post-anode region. This paper illustrates the design of high power 60kW electron gun that successfully focuses the electron beam through simulation by using CST Particle Studio.